package com.heima.kafka.sample;

import org.apache.kafka.clients.consumer.ConsumerConfig;
import org.apache.kafka.clients.consumer.ConsumerRecord;
import org.apache.kafka.clients.consumer.ConsumerRecords;
import org.apache.kafka.clients.consumer.KafkaConsumer;

import java.time.Duration;
import java.util.Collections;
import java.util.Properties;

/**
 * @author JianKang
 * @create 2023-10-25 13:00
 */
public class ConsumerQuickStart {
    public static void main(String[] args) {
        //1.kafka链接配置信息
        Properties properties = new Properties();
        properties.put(ConsumerConfig.BOOTSTRAP_SERVERS_CONFIG, "192.168.8.8:9092");
        //设置消费者组
        properties.put(ConsumerConfig.GROUP_ID_CONFIG, "group1");
        //key和value的序列化
        properties.put(ConsumerConfig.KEY_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");
        properties.put(ConsumerConfig.VALUE_DESERIALIZER_CLASS_CONFIG, "org.apache.kafka.common.serialization.StringDeserializer");

        //2.创建消费者组
        KafkaConsumer<String, String> kafkaConsumer = new KafkaConsumer<>(properties);

        //3.订阅主题
        kafkaConsumer.subscribe(Collections.singletonList("itcast-topic-input"));

        //4.拉取消息
        while (true) {
            //1s拉取一次
            ConsumerRecords<String, String> consumerRecords = kafkaConsumer.poll(Duration.ofMillis(1000));
            for (ConsumerRecord<String, String> consumerRecord : consumerRecords) {
                System.out.println("-----------------------");
                System.out.println(consumerRecord.key());
                System.out.println(consumerRecord.value());
                System.out.println(consumerRecord.offset());
                System.out.println(consumerRecord.partition());
                System.out.println("-----------------------");
            }
        }
    }
}
